Thwaite



uo'.'625,274. a Patented May 16, I899.

'R. H. POST LETHWAITE. DRIVE MECHANISM FOR ROTARY GRIZZLIES 0B SEPARATORS.

(Application filed Deg. 6, 1897.)

(No Model.)

NITED STATES PATENT OFFICE.

ROBERT II. POSTLETHWAITE, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO THE RISDON IRON AND LOOOMOTIVE WORKS, OF SAME PLACE.

DRIVE MECHANISM FOR ROTARY GRIZZLIES OR SEPARATORS.

SPECIFICATION forming part of Letters Patent No. 625,274, dated May 16, 1899.

Application filed December 6, 1897. Serial No. 660,938. (No model.)

To all whom, it may concern.-

Be it known that I, ROBERT H. Pos'rLE- THW'AITE, a subject of the Queen of Great Britain, residing at San Francisco, in the county of San Francisco and State of California, have invented certain new and useful Improvements in Drive Mechanism for R0- tary Grizzlies or Separators; and I do hereby declare that the following isa full, clear, and exact description thereof.

The present invention relates to certain new and useful improvements in the drive mechanism for the rotating grizzly or separator used in connection with that class of dredgers known as gold-dredgers, and it consists in the arrangement of parts and details of construction, as will hereinafter be fully set forth in the drawings and described and pointed out in the specification.

Owing to the continuous movement of the dredge boat, float, or platform'upon which the rotary grizzly or separator and its drive mechanism are mounted, considerable trouble is experiencedin so setting the drive mechanism to the inclined grizzly or separator as to permit of an even or regularmotion being transmitted to the said grizzly or separator, due to the fact that the sudden jar of the boat, float, or platform, owing to the motion of the water or strain of the machinery, serves to quickly work the drive mechanism out of line or apart, the lost motion thus created causing an uneven transmission of power to the said grizzly or separator.

The object of the present invention is to so support the shaftin g of the drive mechanism that the pinions thereof will at all times be held securely in mesh and be prevented from springing apart by reason of the jarring of the dredger itself.

In order to understand the invention, reference must be had to the accompanying sheet of drawings, forming a part of this application, wherein- Figure 1 is a top plan view of the drive mechanism, said view showing a portion of the rotary grizzly or separator; and Fig. 2 is a side view in elevation of the mechanism illustrated by Fig. 1.

The rotary grizzly or separator A is arranged at an incline, and the upper end thereof, which receives the gravel or material to be worked, is provided with cog-ring A, with which meshes the intermediate idler cog-wheel B,mounted upon the short shaft B. This cogwheel B receives its motion from the cogpinion B mounted upon the shaft B which shaft is arranged parallel with the shaft B, and said shaft is driven from the cross-shaft C by means of the intermeshing bevel-gears O 0 mounted upon the shaft B and crossshaft 0, respectively, Fig. 1. To one end of the cross-shaft G is secured the drive-wheel D, which is driven from any suitable machinery by means of a drive-belt. (Not shown.) The shaft B works in bearing-box a of the bracket D attached to the face of upright 1, and in bearing-box a, formed in the hub a extending at a right angle to the bracket D attached to the face of upright 2, while the parallel shaft B works in bearing 5, formed in the outer end of bracket D and bearing 1), formed in the outer end of bracket D It will thus be noticed that bearings a and b for the shafts B and B are formed integral with the brackets D and D neither shaft B B nor intermediate idler cog-wheel B or cog-pinion B can be moved or separated from each other without one of the brackets or bearing-boxes breaking.

The shaft B extends beyond the bearing b and works through bearing d of the bracket E, bolted to the cross-timber 3. This bracket E is provided with an outwardly-extending curved arm E, which terminates in a bearing d, within which the cross-shaft 0 works, the opposite end of said shaft working in bearing d attached to the top of timber 3. The bearings cl and d being integral with the bracket E, the bevel-gears C G will at all times be held in mesh. This manner of constructing the bearingsthat is, two bearings for each bracket-and arrangingthe shafting forms a fixed connection between the parts and prevents the drive mechanism being moved apart or separated by jolting, jarring, or rough usage, which is an important fea-- ture in connection with machinery of this class, as it insures a steady uninterrupted movement being transmitted to the rotary grizzly or separator.

Consequently v As the grizzly or separator when used in connection with gold-dredgers is set at an incline, the trouble experienced in properly setting or running the drive mechanism is obviated where the bearings of the shafting are formed integral with the brackets, for in such case the brackets are made in accordance with the inclination at which the grizzly or separator is set, and it is only necessary to bolt the brackets in place to secure the proper angle or pitch of the shafting.

Having thus described my invention, what I claim as new, and desire to secure protection in by Letters Patent, is

The combination with an inclined rotary grizzly or separator having a cog-ri n g attached thereto, of an intermediate gear meshing with said ring, a shaft for said gear, a second parallel shaft carrying a pinion meshing with ROBERT H. POSTLETHWAITE.

Witnesses:

N. A. ACKER, LEE D. CRAIG. 

